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Mexican Spaghetti Squash Casserole

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By Veronica Mills • March 20th, 2026
Golden melted cheese tops this Mexican spaghetti squash casserole with black beans and vibrant vegetables Save to Pinterest
Golden melted cheese tops this Mexican spaghetti squash casserole with black beans and vibrant vegetables | cookedstories.com

This hearty Mexican-inspired casserole transforms tender roasted spaghetti squash into a satisfying main dish. The squash strands are combined with a flavorful mixture of black beans, sweet corn, bell peppers, and aromatic spices like cumin, chili powder, and smoked paprika. After baking under a generous layer of cheddar and Monterey Jack cheeses, the result is a bubbling, golden-topped creation that's naturally gluten-free and packed with protein. The dish comes together in just over an hour, with most of the time being hands-off while the squash roasts in the oven.

The first time I made this spaghetti squash casserole, my roommate walked into the kitchen and asked why I was making pasta on a weeknight. When I explained it was actually squash, she stood there watching me shred the strands with this look of genuine disbelief on her face. Now it is the one meatless dinner she actually requests by name.

I brought this to a friend's potluck last winter, and people kept hovering around the baking dish asking what made it smell so incredible. The smoked paprika does something magical when it mingles with the melting cheese. Someone actually asked for the recipe before they even finished their first serving.

Ingredients

  • Spaghetti Squash: Pick one that feels heavy for its size and has a hard, unblemished shell
  • Red Bell Pepper: Adds sweetness to balance the spices, and red looks gorgeous against the golden cheese
  • Black Beans: Rinse them thoroughly to avoid any murky canning liquid in your casserole
  • Cumin and Chili Powder: This spice blend creates that authentic Mexican flavors we all crave
  • Smoked Paprika: The secret ingredient that makes people ask what you did differently
  • Cheddar and Monterey Jack: The combo gives you sharp flavor plus perfect meltiness

Instructions

Roast the Squash:
Cut that spaghetti squash in half and scoop out the seeds, then roast it cut-side down until a fork slides through the flesh like butter.
Sauté the Veggies:
Cook your onion, peppers, and garlic until softened, then stir in the spices so they bloom and release all their aromatic oils into the pan.
Build the Filling:
Combine the beans, corn, tomatoes, and spiced vegetables, letting everything get friendly and developing those layered flavors.
Shred and Combine:
Use your fork to pull that squash into strands and toss it with the veggie mixture and half the cheese.
Bake Until Golden:
Spread everything in your casserole dish and top with the remaining cheese, then bake until bubbly and the edges are turning that perfect golden brown.
Baked Mexican spaghetti squash casserole featuring roasted squash strands mixed with spiced black beans and corn Save to Pinterest
Baked Mexican spaghetti squash casserole featuring roasted squash strands mixed with spiced black beans and corn | cookedstories.com

My dad texted me at midnight the first time he tried this, saying he had sneaked back to the fridge for seconds even though he was already full. There is something deeply satisfying about a vegetarian dish that can convert the skeptics in your life without making a big deal about being healthy.

Making It Your Own

Sometimes I will add roasted sweet potato cubes to the filling, especially in fall when they are at their peak. The sweetness plays so nicely with the smoky spices.

The Cheese Factor

I have tried using just cheddar or just Monterey Jack, but the combination is truly worth buying both cheeses. The cheddar brings the punch while the Jack creates that gorgeous cheese pull everyone loves.

Serving Ideas

This casserole is substantial enough to stand alone, but a crisp green salad with a lime vinaigrette cuts through the richness beautifully. Some warm tortillas on the side never hurt either.

  • Serve with avocado slices and sour cream for extra creaminess
  • Hot sauce at the table lets everyone dial up their preferred heat level
  • A cold Mexican beer or lime sparkling water completes the meal perfectly
Gluten-free Mexican spaghetti squash casserole fresh from the oven with bubbling cheddar and Monterey Jack cheese Save to Pinterest
Gluten-free Mexican spaghetti squash casserole fresh from the oven with bubbling cheddar and Monterey Jack cheese | cookedstories.com

This is the kind of dinner that makes vegetarian eating feel like a treat instead of a compromise.

Recipe Questions & Answers

Yes, you can assemble the entire casserole up to 24 hours in advance and refrigerate before baking. You may need to add 5-10 minutes to the baking time if baking cold from the refrigerator.

Store cooled leftovers in an airtight container in the refrigerator for 3-4 days. Reheat individual portions in the microwave or cover the dish with foil and warm in a 350°F oven until heated through.

Yes, this freezes well. Assemble the unbaked casserole, wrap tightly in plastic and foil, and freeze for up to 3 months. Thaw overnight in the refrigerator before baking as directed.

This pairs wonderfully with a simple green salad, sliced avocado, or tortilla chips. You could also serve it alongside Mexican rice or steamed vegetables for a complete meal.

Absolutely. The portions hold up well for several days and can be reheated easily. Divide into individual containers for quick lunches throughout the week.

The spice level is mild to medium, coming from the chili powder and optional jalapeño. Adjust the heat by adding more jalapeño, crushed red pepper flakes, or your favorite hot sauce.

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Golden melted cheese tops this Mexican spaghetti squash casserole with black beans and vibrant vegetables
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Mexican Spaghetti Squash Casserole

Vibrant casserole with roasted squash, black beans, and Mexican spices baked under golden melted cheese.

Prep 20m
Cook 50m
Total 70m
Servings 4
Difficulty Easy

Ingredients

Vegetables

  • 1 large spaghetti squash (about 3 lbs)
  • 1 medium red bell pepper, diced
  • 1 small red onion, diced
  • 2 cloves garlic, minced
  • 1 jalapeño, seeded and minced (optional)
  • 1 cup frozen corn kernels, thawed

Beans

  • 1 can (15 oz) black beans, drained and rinsed

Canned Goods

  • 1 can (14 oz) diced tomatoes, drained

Spices & Seasonings

  • 1½ tsp ground cumin
  • 1 tsp chili powder
  • 1 tsp smoked paprika
  • ½ tsp dried oregano
  • ½ tsp salt
  • ¼ tsp black pepper

Dairy

  • 1 cup shredded cheddar cheese
  • ½ cup shredded Monterey Jack cheese

Fresh Herbs & Garnishes

  • ¼ cup chopped fresh cilantro
  • 1 lime, cut into wedges

Instructions

1
Roast the Spaghetti Squash: Preheat oven to 400°F. Line a baking sheet with parchment paper. Halve the spaghetti squash lengthwise and scoop out the seeds. Brush the cut sides lightly with olive oil, place cut-side down on the prepared baking sheet, and roast for 35–40 minutes until the flesh is tender and easily shredded with a fork.
2
Sauté the Vegetables: While the squash roasts, heat a large skillet over medium heat. Add a splash of olive oil, then sauté the onion, bell pepper, jalapeño (if using), and garlic for 4–5 minutes until softened.
3
Prepare the Filling: Stir in the corn, black beans, and drained tomatoes. Add cumin, chili powder, smoked paprika, oregano, salt, and pepper. Cook for another 3–4 minutes, stirring occasionally. Remove from heat.
4
Shred the Squash: Once the spaghetti squash is cool enough to handle, use a fork to shred the flesh into strands. Reduce oven temperature to 375°F.
5
Combine and Assemble: In a large mixing bowl, combine the shredded spaghetti squash with the vegetable-bean mixture. Stir in half of the cheddar and Monterey Jack cheeses. Transfer the mixture to a lightly greased 9x13-inch casserole dish. Sprinkle the remaining cheese evenly on top.
6
Bake the Casserole: Bake for 20–25 minutes, or until the casserole is hot and the cheese is bubbly and lightly golden.
7
Garnish and Serve: Garnish with chopped cilantro and serve with lime wedges.
Additional Information

Equipment Needed

  • Baking sheet
  • Sharp knife
  • Large skillet
  • Mixing bowl
  • 9x13-inch casserole dish
  • Fork
  • Spoon or spatula

Nutrition (Per Serving)

Calories 335
Protein 15g
Carbs 44g
Fat 11g

Allergy Information

  • Contains dairy (cheese). Gluten-free as written. For dairy-free, use plant-based cheese alternatives. Always check labels for processed ingredients like cheese and canned beans.
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Veronica Mills

Home cook sharing easy, wholesome recipes and helpful kitchen tips for every food lover.